Commitc136eb0

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doc: mention vacuum's removal of commit timestamp information

Reported-by: Kyotaro HORIGUCHIDiscussion:https://postgr.es/m/20180622.172132.230342845.horiguchi.kyotaro@lab.ntt.co.jpCo-authored-by: Kyotaro HORIGUCHIBackpatch-through: 16

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Original file line number	Diff line number	Diff line change
`@@ -25704,7 +25704,8 @@ SELECT collation for ('foo' COLLATE "de_DE");`
`25704`	`25704`	`They only provide useful data when the`
`25705`	`25705`	`<xref linkend="guc-track-commit-timestamp"/> configuration option is`
`25706`	`25706`	`enabled, and only for transactions that were committed after it was`
`25707`		`- enabled.`
	`25707`	`+ enabled. Commit timestamp information is routinely removed during`
	`25708`	`+ vacuum.`
`25708`	`25709`	`</para>`
`25709`	`25710`
`25710`	`25711`	`<table id="functions-commit-timestamp">`

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